24 hour filter samples of PM10 (particulate matter < 10 micrometer) collected with the high-volume sampler at Jungfraujoch
during a strong sahara dust event (on 20 June 2006; filter 076171, on the right; 62.3 microgram per m3) and
during usual summer conditions (on 04 June 2006; filter 076155 on the left; 2.3 microgram per m3).